/*
 * Copyright 2013-2018 Lilinfeng.
 *  
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *  
 *      http://www.apache.org/licenses/LICENSE-2.0
 *  
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.phei.netty.protocol.file;

import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelOption;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioServerSocketChannel;
import io.netty.handler.codec.LineBasedFrameDecoder;
import io.netty.handler.codec.string.StringDecoder;
import io.netty.handler.codec.string.StringEncoder;
import io.netty.util.CharsetUtil;

/**
 * @author lilinfeng
 * @date 2014年2月14日
 * @version 1.0
 */
public class FileServer {

	public void run(int port) throws Exception {
		EventLoopGroup bossGroup = new NioEventLoopGroup();
		EventLoopGroup workerGroup = new NioEventLoopGroup();
		try {
			ServerBootstrap b = new ServerBootstrap();
			b.group(bossGroup, workerGroup)
					.channel(NioServerSocketChannel.class)
					.option(ChannelOption.SO_BACKLOG, 100)
					.childHandler(new ChannelInitializer<SocketChannel>() {
						/*
						 * (non-Javadoc)
						 * 
						 * @see
						 * io.netty.channel.ChannelInitializer#initChannel(io
						 * .netty.channel.Channel)
						 */
						@Override
						public void initChannel(SocketChannel ch) throws Exception {
							//StringEncoder + LineBasedFrameDecoder :文本换行符解码器
							//将数据报解码成字符串
							ch.pipeline().addLast(new StringEncoder(CharsetUtil.UTF_8));
							//按照回车换行符对数据报进行解码
							ch.pipeline().addLast(new LineBasedFrameDecoder(1024));
							//将文件内容编码成字符串输出在控制台
							ch.pipeline().addLast(new StringDecoder(CharsetUtil.UTF_8));
							
							ch.pipeline().addLast(new FileServerHandler());
						}
					});
			
			ChannelFuture f = b.bind(port).sync();
			System.out.println("Start file server at port : " + port);
			f.channel().closeFuture().sync();
		} finally {
			// 优雅停机
			bossGroup.shutdownGracefully();
			workerGroup.shutdownGracefully();
		}
	}

	public static void main(String[] args) throws Exception {
		int port = 8080;
		if (args.length > 0) {
			try {
				port = Integer.parseInt(args[0]);
			} catch (NumberFormatException e) {
				e.printStackTrace();
			}
		}
		new FileServer().run(port);
	}
}
